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Plumbing in the Home/First floor toilet has giant gurging/burp

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Question
Okay,

my house was built in 1925.  I've lived in it for almost 4 years.
When I first moved in I had the main sewer line snaked and scoped (no issues on the main line.  

The plumber suggested an annual snaking.

We have been away for 5 days for the holiday.

This morning the family was getting ready.  Three of us took showers in the 2nd floor bathroom.

After the third person finished their shower, about 5 minutes later he toilet on the first floor let out a giant burping noise and after about 5 to 10 seconds sprayed water all over the bathroom.

We've never had this happen before.

My initial thought is to have the main line snaked as I might have a partial blockage.

Thanks.

Answer
That's what I would do. If the drain is pressurizing enough to cause sewage to spray out of the toilet it is time to clear the lines. The plumber will be able to look at the layout and determine the most likely area of obstruction but generally I would be thinking it is a root problem and likely you need some serious main line cleaning. It is amazing how blocked a line can be with roots and still allow flow through the line.
Good Luck

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Cortez (cort) Cate

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PLEASE read this entire introduction. I have been doing this for a long time and I have come to the conclusion that if you are not willing to take the time to write a detailed question then don't expect a detailed solution! I am getting far to many questions that do not give enough detail to warrant a good solution. I realize it is a little difficult to formulate a good question but if you want a good answer you have to give me good details....read this entire introduction please....remember this website is world wide I have no clue where you live if you don't tell me.....to give more detail on the fixture you are having problems with...a one piece eljer 3.5 gallon flush will be totally different than a one-gallon flush toto.....details are important. I can answer most questions related to residential and commercial plumbing for many buildings. I have sufficient knowledge of the UPC and UMC. I will speculate for you if necessary. In those cases I will try to give you some guidance and you should use that to refine the question further and we, together, can seek the answer via a follow up. Plumbing codes and practices vary around the world--If you don't tell me where you live the answer I give may not fit your locality. I am giving my time to you as a way of fulfilling my perceived obligation to share. I am here to try to help you find a solution to your problem. REMEMBER, If you want a good answer you need to ask a detailed question and include where you live, type of pipes, type of building, water pressure if it is a water problem, type of heater, age of appliance & building all these and many more are variables that have an effect on various situations. Detailed information will help produce a better answer.

Experience

Since 1972 a California licensed B-1 General Building Contractor, C-36 Plumbing and C-16 Fire Sprinkler Contractor; also installing and servicing Heating, Air Conditioning and Sheet Metal operating as C and C Building and Plumbing, California State License 279516. In 1995 I downsized the company to become semi-retired. Still I remain active in the construction industry. As head of a company I placed personnel and job safety as the number one objective followed closely by training and continuing education. Always seeking to stay informed of leading edge technology in the industry. Also I have spent several years as an Apprenticeship Instructor in the Pipe Trades Unions. Additionally I am a certified OSHA instructor.

Education/Credentials
United Association of Plumbers and Steamfitters Instruction Training, Ann Arbor, MI Bakersfield College, Bakersfield CA Cal Poly San Luis Obispo, San Luis Obispo, CA Foothill College, Los Altos, CA California Licensed Contractor from 1971

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